Regioselective Synthesis of Difluorinated <i>C</i>-Furanosides Involving a Debenzylative Cycloetherification
作者:Julien A. Delbrouck、Valentin N. Bochatay、Abdellatif Tikad、Stéphane P. Vincent
DOI:10.1021/acs.orglett.9b01878
日期:2019.7.19
A highly regioselective synthesis of valuable gem-difluorinated C-furanosides from unprotected aldoses via a debenzylative cycloetherification (DBCE) reaction induced by diethylaminosulfur trifluoride is descibed. The scope and limitations of this DBCE reaction are described using a series of commercially available pentoses and hexoses to afford, without selective protection/deprotection sequences
Synthesis of trifluoromethyl analogue of L-fucose and 6-deoxy-D-altrose
作者:Romesh C. Bansal、Barbara Dean、Sen-itiroh Hakomori、Tatsushi Toyokuni
DOI:10.1039/c39910000796
日期:——
Trifluoromethylation of the acyclicderivative of D-lyxose, 3, with trifluoromethyltrimethylsilane in the presence of tetrabutylammonium fluoride yielded a mixture of trifluoromethyl adducts, 5a and b, which was converted to 6,6,6-trifluoro-L-fucose 9a and 6-deoxy-6,6,6-trifluoro-D-altrose 9bvia selective oxidation of the primary hydroxy group involving treatment of the trimethylsiloxy derivatives, 7a and b, with
Synthesis of acyclic galactitol- and lyxitol-aminophosphonates as inhibitors of UDP-galactopyranose mutase
作者:Weidong Pan、Christophe Ansiaux、Stéphane P. Vincent
DOI:10.1016/j.tetlet.2007.04.113
日期:2007.6
UDP-galactopyranose mutase (UGM) catalyzes the isomerization of UDP-galactopyranose (UDP-Galp) into UDP-galactofuranose (UDP-Ga1f), an essential step of the mycobacterial cell wall biosynthesis. Acyclic alditol-aminophosphonates in the D-galactose and D-lyxose series were designed as mimics of high energy intermediates of the UGM catalyzed isomerization. Interestingly, the D-lyxitol-aminophosphonate displayed better inhibition properties than the D-galactitol-aminophosphonatc. (c) 2007 Elsevier Ltd. All rights reserved.